JP3826704B2 - Manufacturing method of coil with defect marking - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a defect-marked coil in a steel process line. More specifically, the present invention relates to a method for manufacturing a defect-marked coil in an iron and steel process line that can reliably display a defect by marking a defective portion of a steel sheet and contribute to quality assurance.
[0002]
[Prior art]
Cold-rolled steel sheets manufactured by cold rolling are inspected for surface defects over the entire length of the coil for quality assurance. As a surface defect detection method for cold-rolled steel sheets, the surface of the steel sheet traveling in the line is scanned in the width direction with a laser beam, and the reflected light is converted into voltage intensity by a photoelectric conversion element such as a CCD element. A method has already been established for determining the presence or absence and the extent of the problem. As for internal defects of steel sheets, a method for detecting defects by calculating the depth and scale of defects in the thickness direction of defective steel sheets using a magnetic flaw detector has already been established (Japanese Patent Laid-Open No. Hei 5-196581).
[0003]
Normally, the defect inspection result is displayed on the CRT or the like as information on the position of the defect, defect name, defect grade, etc., or printed out in a document.
[0004]
It is impossible to manufacture all products without defects. Therefore, after removing the buyer's harmful defect part based on the defect information displayed on the CRT etc. in the line, or after removing the buyer's harmful defect part by re-inspecting in the next process based on the defect information Ships. In addition, the purchaser submits a document describing the defect information printed out together with the coil including the harmful defect portion, and the purchaser removes the harmful defect.
[0005]
When removing harmful defects in the line or the next process, there is no clear standard for the degree of harm of surface defects, so removal of harmful defects is an overaction from the viewpoint of quality assurance. In addition, the harmful defect portion may not be removed due to a determination error such as an overlooked or hard-to-determine defect. Further, by removing the harmful defect portion, the unit weight of the coil is reduced, and there is a problem such as a reduction in work efficiency of the purchaser.
[0006]
On the other hand, the coil purchaser must work while checking the data of the document containing the defect information against the actual product, which is not only troublesome, but in some cases the defect is overlooked. There is a risk of being processed.
[0007]
For this reason, in Japanese Patent Application Laid-Open No. 4-291138, marking is performed using a marking device that sprays paint or the like on the barbed portion of the steel plate detected by the wrinkle detection device, and the purchaser reexamines the barbed portion. It has been proposed to make it easy to identify the hooked part when doing so.
[0008]
[Problems to be solved by the invention]
However, in the marking method disclosed in Japanese Patent Laid-Open No. 4-291138, since there is no confirmation as to whether or not the marking is performed normally, if the marking is abnormal, the purchaser is more disturbed than before. In addition, when paint is sprayed, the markings are shaded, and in places where there is a lot of paint, there is a risk that the paint will cause creases in normal parts after drying. In the case of the spray method, there is no problem when the steel plate is oil-free, but in the case of a steel plate after oil coating, the coating is sprayed on the oil film, so that no marking remains on the surface of the steel plate.
[0009]
Further, if all the marked parts are marked, there are also harmful effects such as complicated work due to the markings on defective parts that are harmless to the purchaser, and the work efficiency is reduced.
[0010]
In addition, it is better for the purchaser to detect the defect marking at the defect portion when the defect marking position is automatically detected and manually (visually) detected. That is, when the defect marking is automatically detected, the position of the defect marking is constant, and when the defect marking is detected manually, the work efficiency is better when the defect marking is performed at the defect position.
[0011]
Moreover, it may be preferable to change the position of defect marking according to the use of a steel plate. For example, when using steel plates by pressing and blanking, if the position of the defect marking is constant, there are defects such as defects but no defect marking after pressing, and conversely there are defect markings but no defects. May occur. In such cases, the purchaser is more troublesome than ever.
[0012]
Also, even in the same defect, it is a harmful defect in the center of the steel sheet, but it is a harmless defect at the edge of the steel sheet, or a harmful defect on the surface of the steel sheet, but it is a harmless defect on the back surface of the steel sheet, The degree of harm varies depending on the application.
[0013]
In addition, internal defects (for example, two plates) of a steel plate cannot be detected with the naked eye, causing cracks and the like when severe processing such as pressing is performed on the steel plate. Therefore, it is beneficial to mark internal defects as well as surface defects.
[0014]
The present invention takes the above-mentioned problems into consideration, and its main purpose is to perform defect marking according to the usage pattern of the purchaser, without causing wrinkles on the steel sheet due to the defect marking, and the steel sheet. It is an object of the present invention to provide a manufacturing method of a defect-marked coil that makes it possible to reliably and easily identify harmful defects regardless of whether or not oil such as rust preventive oil is attached to the surface.
[0015]
[Means for Solving the Problems]
The gist of the present invention for solving the above problems is as follows.
[0018]
( 1 ) Calculate the defect name, defect grade, defect length, and defect position in the width direction on the surface defect of the coil on a line equipped with a surface defect meter or an internal defect meter in advance, and identify harmful and difficult-to-determine defects. In addition, a process of calculating the defect length and the defect position in the width direction for the inner flaw of the coil, and further identifying a harmful defect / harmless defect, and an ink marker device for marking the coil with ink are installed. When the harmful defect / difficulty defect is reached to the ink marker device based on the information on the harmful defect / difficult defect that has been identified in advance, and the process of continuously processing the steel sheet A defect-marked coil manufacturing method, wherein the defect position is marked with ink.
[0019]
( 2 ) A defect identified as a hard-to-determine defect by a surface defect meter is re-determined by the inspector to be identified as a harmful defect or a harmless defect, and the defect position of the harmful defect is marked with ink. (1) The manufacturing method of the coil which carried the defect marking of description.
[0020]
( 3 ) The above-mentioned (1), wherein an alarm is output for a defect identified as a hard-to-determine defect by a surface defect meter, and an automatic deceleration is performed so that the inspector re-determines the hard-to-discriminate defect. Or (2) The manufacturing method of the coil marked with the defect described in any one of the items.
[0021]
( 4 ) The defect image display and the defect position display described above, when the inspector redetermines the defect identified as a hard-to-determine defect by the surface defect meter ( 2 ) Or ( 3 The manufacturing method of the coil which carried the defect marking of description.
[0022]
( 5 ) Defects in the width direction of surface defect meters and internal defect meters position (1) to (1), wherein the position of the defect marking is changed based on 4 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0023]
( 6 (1) to (1) to (1), wherein the position of the defect marking is changed according to the use of the steel plate. 5 The defect-marked coil method according to any one of items 1).
[0024]
( 7 (1) to (1) to (1), wherein marking is performed by distinguishing between harmful defects and defects that are difficult to distinguish. 6 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0025]
(8 (1) to (1) to (1) above, wherein distinction between harmful defects and difficult-to-determine defects is performed by changing the color of the defect marking. 7 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0026]
( 9 (1) to (1) above, wherein the color of the defect marking is changed according to the type of the steel sheet. 8 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0027]
( 10 ) A defect marking detection device is installed downstream of the ink marker device and the marking state is monitored. 9 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0028]
( 11 (1) to (1), wherein the threshold value of the defect marking detection device is changed in accordance with the type of steel plate. 10 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0029]
( 12 (1) to (1), wherein the ink marker device and the defect marking detection device are set to follow the defect marking position. 11 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0030]
( 13 (1) to (1), wherein an ink drying device is installed downstream of the ink marker device. 12 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0031]
( 14 (1) to (1), wherein the ink marker device, the defect marking detection device, and the ink drying device are set to follow the defect marking position. 13 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0032]
( 15 (1) to (1) to (1), wherein threshold values of harmful defects and harmless defects are changed according to the use of the steel sheet. 14 The manufacturing method of the coil which carried out the defect marking as described in any one of (4).
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described. 1 to 4 show examples of arrangements of main equipment of a continuous processing line for steel plates used for explaining embodiments of the present invention.
[0035]
In FIG. 1, 3 is a surface defect meter, and includes a detector 2 and a signal processing unit 4 on the front and back of a steel plate 1, 5 is a CRT, 6 is a centralized control panel, 7 is a secondary determination input device, 8 is a defect marking device ( Ink marker device), 9 is a defect marking detection device, 10 is a tension reel, 11 is a transport roll, 12 is a pulse transmitter, 13 is a steel plate transport distance calculation device, 14 is an external storage device, 15 is a cutting machine, and 16 is an inspection. It is a stand.
[0036]
In FIG. 2, a magnetic flaw detector (internal defect meter) 34 including a magnetic sensor 35 for detecting an internal defect of the steel sheet 1 and a signal processing unit 36 is additionally provided in the apparatus shown in FIG. 1. 3 and 4, an ink drying device 40 for drying the marked ink is attached downstream of the defect marking device (ink marker device) 8 of the device shown in FIGS. 1 and 2, respectively.
[0037]
In the apparatus shown in FIGS. 1 to 4, the front and back detectors 2 of the steel sheet 1 of the surface defect meter 3 detect defect candidate defects on the front and back surfaces of the steel sheet 1, and send the detected signals to the signal processing unit 4. The signal processing unit 4 calculates a defect name, a defect grade, a defect length, and a width direction defect position based on a signal obtained from a feature amount of a defect candidate having a signal exceeding a certain threshold.
[0038]
Further, an internal defect of the steel plate 1 is detected by the magnetic sensor 35 of the magnetic flaw detector 34 and the detected signal is sent to the signal processing unit 36. The signal processing unit 36 calculates the defect length and the width direction position of the defect based on the signal obtained from the feature amount of the defect candidate of the signal exceeding a certain threshold value, and the calculation result is used as the signal processing unit of the surface defect meter 3. Send to 4.
[0039]
In addition, the marking target defect name (including the internal defect if the internal defect meter 34 is provided), the defect grade, the edge dead zone, and other marking information sent from the host computer 23 for each front and rear surface, and the surface defect meter 3 The marking command is calculated from the result of calculation based on the detected defect information or based on the type and use of the steel sheet.
[0040]
Further, the calculated marking command and the calculated defect information are displayed on the screen of the CRT 5, and the defect occurrence signal, the defect information, and the defect position are output to the centralized control panel 6.
[0041]
Further, the number of rotations of the transport roll 11 that transports the steel sheet 1 is measured by the pulse transmitter 12, the steel sheet transport distance calculation device 13 calculates the steel sheet feed length, and the calculation result is output to the centralized control panel 6. The centralized control panel 6 edits the above defect information to discriminate harmful defects / defects that are difficult to distinguish (defects for internal defects; the same shall apply hereinafter) from the defect name and defect grade, and if necessary, Further, harmful defects and difficult-to-discriminate defects are discriminated in consideration of defect position information on the front and back surfaces and the use of the steel sheet. Further, if necessary, the centralized monitoring panel 6 further determines the presence / absence of marking for the harmful defects and difficult-to-discriminate defects discriminated above.
[0042]
The centralized control panel 6 tracks the position of the defect based on the steel sheet feed length sent from the steel sheet transport distance calculation device 13 and outputs a warning for reaching the difficult-to-determine defect to the redetermination place (inspection table) 16. If necessary, automatic deceleration is performed and a defect image is displayed on the CRT 5a to facilitate the operator's defect determination.
[0043]
When the defective part reaches the secondary determination place (inspection table) 16, the operator performs a visual inspection to make a secondary determination, and the detection result of the surface defect meter 3 is confirmed by the CRT 5 to compare whether the result is correct. To do. When the results are different, correction is performed, and the correction result is input to the secondary determination input device 7 and further output to the centralized control panel 6. FIG. 5 is a diagram showing an example of the screen display of the CRT 5. The already displayed defect information is the information of the surface defect meter 3, and the blank is a place to input the secondary determination result.
[0044]
The centralized control panel 6 re-edits the defect information based on the correction information, and discriminates harmful defects and difficult-to-determine defects from the defect name and defect grade. Further, the centralized control panel 6 is based on the feed length of the steel plate 1 obtained from the number of rotations of the transport roll 11, and determines the position of the harmful defect / determination difficult defect position (if marking is determined, marking is present). ), And before the defect portion passes through the defect marking device 8, the defect marking device 8 and the defect marking detection device 9 are moved to a position where there is a defect. Then, when the defective part passes through the defect marking device 8, an activation signal is output so as to activate the defect marking device 8.
[0045]
The defect marking device 8 is activated based on the activation signal, and marking is performed on the harmful defect portion and the difficult-to-determine defect portion in synchronization with the timing when the harmful defect / difficult-to-determine defect passes through the defect marking device 8.
[0046]
The defect marking device 8 starts marking simultaneously with the marking command. The marking is performed by directly pressing the felt soaked with the ink against the steel plate 1 so that the ink adheres to the steel plate 1. Even an oiled coil can be reliably marked on the surface of the steel sheet. In addition, since there is no problem of shading like a paint, no pressing wrinkles are generated on the steel sheet surface. Since the felt is in direct contact with the steel plate 1 and wears out, if the marking exceeds the reference length, an alarm is output from the central control panel 6 to prompt the operator to change the felt.
[0047]
The marking length is set so that the defect portion does not come out of the defect marking in consideration of the tracking accuracy of the defect position. In consideration of tracking accuracy, this apparatus adds 0.5 m before and after the defect length discriminated by the central control panel 8 and outputs a command to mark the defect length 1 m longer than the defect length. In the case of a point-like defect having a length of about several millimeters or less, a command is output so that marking is performed by adding 0.25 m before and after.
[0048]
It is more desirable to determine the length of the marking by an agreement with the purchaser. Further, the central control panel 6 monitors the allowable number of markings and the allowable length of marking as other management items, and outputs an abnormality alarm to the alarm device 24 when these exceed the allowable values.
[0049]
The host computer 23 performs management for each coil based on information from the centralized control panel 6 and determines whether or not shipment is possible.
[0050]
FIG. 6 is a diagram showing the state of the defect portion position and the defect marking position. The harmful defect 20 is within the display range in the length direction of the defect marking 21.
[0051]
From the viewpoint of easy visual detection and easy detection by the defect marking detection device 9, the optimum line width of the marking is in the range of 3 to 10 mm. Further, the pressing pressure of the felt is optimally in the range of 150 to 500 g from the viewpoint of the wear of the felt and the sharpness of the ink.
[0052]
Although one defect marking device 8 may be provided, it is desirable to arrange two and prepare two types of ink so that the color of the marking can be changed.
[0053]
By arranging two defect marking devices 8 and preparing two types of ink, the color of the ink can be changed according to the defect grade (for example, if the purchaser's harmful defect is clear, marking is performed with red ink) , Marking the defects that are difficult to distinguish with blue ink), or changing the color of the ink according to the type of steel sheet (for example, if the steel sheet is white, such as electrogalvanized steel sheet, mark with black ink) In the case of a steel sheet with a black background such as an alloyed hot-dip galvanized steel sheet, marking is performed with white ink.) By using visual inspection, defects can be identified by using a defect marking detection device. When performing identification work, more efficient work becomes possible.
[0054]
Also, in press work etc., the defect marking part may be removed by blanking even though there is a defect, so the defect marking is an arbitrary position in the width direction of the steel plate regardless of the location of the harmful defect part. It is preferable that marking can be performed. In any case, it is necessary to select an ink that disappears with a weak alkaline detergent. However, depending on the use of the steel sheet, it may not be necessary to erase with a weak alkaline detergent.
[0055]
When marking with ink as described above, there is no problem as long as the ink dries, but normal ink requires several seconds to dry. If the ink is not dry, the ink is transferred to a roll or coil. In addition, if oil is applied before the ink is dried, the ink is not dried indefinitely, and the ink is transferred when the coil is wound around the tension reel. The problem can be reliably solved by installing an ink drying device for drying the marked ink downstream of the ink marker device.
[0056]
FIG. 7 is a diagram showing a case where one defect marking device 8 and one defect marking detection device 9 are provided. The defect marking device 8 and the defect marking detection device 9 are disposed at the same position in the width direction of the steel plate 1 of the gantry 25, and the moving device 26 driven by the motor 27 at the position in the width direction of the steel plate indicated by the marking command. It is possible to move through.
[0057]
FIG. 8 is a diagram showing a case where two defect marking devices and two defect marking detection devices are provided. The defect marking device 8a and the defect marking detection device 9a, and the defect marking device 8b and the defect marking detection device 9b are disposed at the same position in the width direction of the steel plate 1 of the mounts 25a and 25b, respectively. Similarly, it can move in the steel plate width direction independently of each other.
[0058]
9 and 10 are views showing an ink drying device installed downstream of the defect marking device. In FIG. 9, the defect marking device 8 and the ink drying device 40 are disposed at the same position in the width direction of the steel plate 1 of the gantry 25. In FIG. 10, the defect marking device 8, the ink drying device 40, and the defect marking detection device. 9 is disposed at the same position in the width direction of the steel plate 1 of the gantry 25, and any device moves to the position in the width direction of the steel plate specified by the marking command via the moving device 26 driven by the motor 27. It is possible.
[0059]
Two defect marking devices 8 and an ink drying device 40 or two defect marking detection devices 9 may be installed. In FIG. 11, the defect marking device 8a, the ink drying device 40a, and the defect marking device 8b. When The ink drying device 40 is disposed at the same position in the width direction of the steel plate 1 of the mounts 25a and 25b. In FIG. 12, the defect marking device 8a, the ink drying device 40a, the defect marking detection device 9a, and the defect marking device. 8b When The ink drying device 40b and the defect marking detection device 9b are disposed at the same position in the width direction of the steel plate 1 of the mounts 25a and 25b, respectively, and in the width direction of the steel plate independently of each other as in the case of the device of FIG. It can be moved.
[0060]
FIG. 13 shows an example of a defective portion and a defect marking position when marking is performed using one defect marking apparatus, and the harmful ink 20 and the hard-to-determine defect 22 are displayed by the defect marking 21 using the same ink. Has been.
[0061]
FIG. 14 shows a case where two defect marking devices are provided and marked using inks of different colors. The harmful defect 20 is indicated by a defect marking 21a (for example, red), and the hard-to-determine defect 22 is indicated by a defect marking 21b. (For example, blue).
[0062]
The defect marking detection device 9 constantly monitors the state of the defect marking, monitors the marking length, ink blur, the presence or absence of marking at a defect-free location, and outputs the monitoring result to the centralized control panel 6. In order to increase the detection accuracy of the defect marking, it is preferable to correct the threshold value of the defect marking detection device according to the type of the steel plate. The centralized control panel 6 judges whether the marking is good or not, and outputs it to the alarm device 24 when it is abnormal to alert the operator and at the same time instruct to hold the shipment of the coil. For coils whose shipment has been suspended, take measures such as re-examination.
[0063]
When it is determined that the defect marking monitored by the defect marking detection device 9 is normal, the defect information and the defect position are input to the external storage device 14 and cut back by the cutting machine 15. The position from the inner circumference of the coil is converted to the position from the outer circumference and printed out.
[0064]
Since the coil is cut by the cutting machine 15 for each purchaser, the coil length reference is based on the cutting signal from the cutting machine 15. Documents to be sent to the purchaser are reversely developed starting from the outer periphery of the coil to make it easier for the purchaser to use.
[0065]
The coil manufactured in this way has a clear mark at the position of the harmful defect. It can be easily discriminated.
[0066]
In the above description, the operator's visual inspection is intervened in the determination of the harmful defect, but the visual inspection may not be performed as long as the defect detection accuracy of the surface defect meter 3 can be satisfied. Further, by installing a defect marking detection device in the next process of the marked coil, it becomes possible to perform a more accurate and efficient defect removal operation.
[0067]
In the apparatus shown in FIGS. 1 to 4, the surface defect meter 3 or the magnetic flaw detector 34, the defect marking device 8, and the defect marking detection device 9 are arranged on the same line. However, as described above, on the line equipped with the surface defect meter or further the internal defect meter, the defect position, defect name and defect grade are determined based on the defect information detected by the surface defect meter or further the internal defect meter. It has already been performed to calculate and display this information on a CRT or the like, or to print it out as a document.
[0068]
Therefore, at least one of the defect marking device and the defect marking detection device is installed on a line different from the line provided with the surface defect meter or the internal defect meter, and harmful by the surface defect meter or the line equipped with the internal defect meter. Based on this information, defects and difficult-to-determine defects are identified, and in the same manner as in the case of the apparatus shown in FIGS. You may make it print out.
[0069]
In this case, the harmful defect / difficult-to-determine defect information edited and discriminated on the line equipped with the surface defect meter or further the internal defect meter is output to the central control panel of another line through the external storage device together with the defect position information, Tracking the harmful and difficult-to-discriminate defects on another line, marking with a defect marking device, monitoring the status of defect marking with a defect marking detection device, re-editing the monitoring results with a centralized control panel, and external storage What is necessary is just to output to an apparatus. By doing in this way, the effect of this invention can be show | played with a cheaper installation.
[0070]
In this case, the example of arrangement | positioning of the main equipment of another line is shown in FIGS. 15 shows the case where the Euler 17 is arranged on the downstream side of the defect marking detection device 9, FIG. 16 shows the case where the Euler 17 is arranged on the upstream side of the defect marking device 8, and FIG. This is a case where the defect marking detection device 9 is disposed on the trimmer 18 and the inspection table 16 on the downstream side. In the case of FIG. 17, if necessary, the result of the visual inspection of the defect on the inspection table can be secondarily corrected in the same manner as in the case of FIGS.
[0071]
An example of working with a marked coil will be described with reference to FIGS.
[0072]
FIG. 18 shows a recoil line, which is a lower process of the continuous line. In addition to the defect marking detection apparatus 9, a cleaning liquid ejecting apparatus 32 and a cleaning liquid wiping apparatus 33 are attached. When the defect marking detection device 9 detects a defect marking of a difficult-to-determine defect, a line stop command is output, and the inspector performs a determination again. The inspector classifies harmful and harmless defects. When it is determined that the defect is harmless, the cleaning liquid spraying device 32 sprays a weak alkaline cleaning liquid to wash off the markings, and then the cleaning liquid wiping device 33 wipes the cleaning liquid and the marking ink and recoats the oil. The defects that have been determined to be difficult to discriminate and the defects and harmful defects determined as harmful defects are removed by the cutting machine 15, and only the non-defective coils are wound up by the tension reel 10.
[0073]
FIG. 19 shows a shear line. The sheet without the defect marking is sent to the non-defective pillar 29, and when the defect marking detection device 9 installed on the entrance side of the sheet line detects the defect marking, it outputs to the gate switching device 28, and the gate switching device 28 switches the gate. The sheet with the defect marking portion is sent to the defective product pillar 30 to remove the harmful defect portion and the difficult-to-determine defect portion.
[0074]
For the steel sheet to be pressed, it is preferable to adopt a marking method considering the application. 20 and 21 are diagrams showing examples of defect marking when the harmful defect portion 20 is inspected visually after pressing. In FIG. 20, when the defect marking 21 is made on the defect portion 20, FIG. 21 shows the case where the defect marking is made at the same location on both sides in the width direction of the steel plate 1 regardless of the location of the defect portion. What is necessary is just to determine suitably the position of a defect marking according to the defect information of a width direction, or the use of a steel plate.
[0075]
As described above, the case where the ink marker device is installed in the defect marking device 8 to mark the defect position or the coil on which the defect marking is further performed has been described. However, the polishing member marking device for marking with a polishing member instead of the ink marker device. May be installed and the defect position may be marked with an abrasive member.
[0076]
In a defect marking device using an abrasive member, marking is performed by pressing an abrasive member such as a grindstone attached to the tip of a cylinder or a nonwoven fabric containing an abrasive directly against the steel plate 1 or pressing the steel plate 1 while rotating a brush roll. .
[0077]
In the case of a defect marker device using an abrasive member, the responsiveness of marking is somewhat inferior to that of an ink marker device, so the marking length and line width are changed somewhat, and the color of the marking is changed like ink. In consideration of the fact that the marking cannot be performed in accordance with the defect clade, the defect marking and the coil with the defect marking can be performed in the same manner as when the ink marker device is used.
[0078]
When an abrasive member is used, it is preferable that the marking length is somewhat longer than the marking length by ink in consideration of tracking accuracy and responsiveness. Specifically, a command is output to add 0.5 m to 1.0 m before and after the defect length discriminated by the central control panel 8 and to mark the defect length 1 m to 2 m longer than the defect length. In the case of a point-like defect having a length of about several mm or less, a command is output so that marking is performed by adding 0.25 m to 1.0 m before and after. The line width of the marking is optimally in the range of 50 to 200 mm from the viewpoint of easy visual detection and easy detection by the defect marking detection device 9. FIG. 22 is a diagram showing the state of the defect portion position and the defect marking position, and the harmful defect 20 is within the display range in the length direction of the defect marking 21.
[0079]
When two ink marker devices are installed, the color of the ink is changed according to the defect grade as shown in FIG. 14, but the color cannot be changed when the polishing member is used. When two abrasive member marker devices are installed, change the marking line according to the defect grade (for example, if the purchaser's harmful defects are clear, mark with one line, and difficult to identify defects with two lines) By performing marking, the same operation as that of the ink marker device can be performed.
[0080]
FIG. 23 shows an example of a defect portion and a defect marking position when marking is performed using two abrasive member marker devices. The harmful defect portion 20 is displayed with one defect marking 21a, and the hard-to-determine defect 22 is displayed with two defect markings 21b.
[0081]
When defect marking is performed using an abrasive member, there is no problem of shading as in the case of paint, so there is no occurrence of pressing wrinkles on the steel sheet surface, and even an oiled coil can be reliably marked on the steel sheet surface. In addition, it is possible to apply oil immediately after marking, and a drying device as in the case of marking with ink is unnecessary, and a simpler device can be achieved.
[0082]
In addition, when marking using a brush roll for a grinding member, the brush roll which can mark the full width of a steel plate may be installed as needed, and it may mark on the whole plate width.
[0083]
【The invention's effect】
As described above, according to the present invention, it is possible to reliably and easily identify harmful defects regardless of the presence or absence of oil such as rust preventive oil on the steel sheet surface without generating flaws on the steel sheet due to the defect marking. A defect-marked coil can be manufactured.
[0084]
Further, by tracking the defect position on the steel plate surface and marking the harmful defect portion, the purchaser can easily detect the defect portion. Moreover, it becomes possible to ship with the necessary coil length by involving the harmful defect portion, and the work efficiency of the purchaser is improved.
[0085]
Furthermore, since the marking display method is changed according to the degree of defects, or appropriate markings are displayed in consideration of the defect name, the degree of defects, and the use of the steel sheet, the work efficiency improvement effect is further improved.
[0086]
By using the ink marker device, the defect marking color display in consideration of the color of the background of the steel sheet is performed according to the type of the steel sheet, thereby improving the work efficiency improvement effect and the effect of preventing the defect from being overlooked.
[0087]
With the grinding member marker device, even the oiled coil can be reliably marked on the surface of the steel sheet, and it can be oiled immediately after marking, and there is also a drying device for marking with ink. Since it becomes unnecessary, it can be made a simpler device.
[0088]
In addition, for the steel plate manufacturer, it is easy to remove harmful defect parts, and the work efficiency is greatly improved. Further, even for difficult-to-determine defects, excessive defect removal work is not required and yield is improved.
[Brief description of the drawings]
FIG. 1 is used to describe an embodiment of the present invention. First The figure which shows the example of arrangement | positioning of the principal part installation of the coiling line of 1 steel plate.
FIG. 2 is a view showing an arrangement example of main equipment of a coiling line of a second steel plate used for explaining the embodiment of the present invention.
FIG. 3 is a view showing an arrangement example of main equipment of a coiling line of a third steel plate used for explaining the embodiment of the present invention.
FIG. 4 is a diagram showing an arrangement example of main equipment of a coiling line of a fourth steel plate used for explaining the embodiment of the present invention.
FIG. 5 is a diagram illustrating an example of a CRT display screen.
FIG. 6 is a diagram showing a state of a defect portion position and a defect marking position.
FIG. 7 is a diagram showing an example of equipment arrangement when one defect marking device and one defect marking detection device are provided.
FIG. 8 is a diagram showing an example of equipment arrangement when two defect marking devices and two defect marking detection devices are provided.
FIG. 9 is a diagram showing an example of equipment arrangement when one defect marking device and one ink drying device are provided.
FIG. 10 is a diagram showing an example of equipment arrangement when a defect marking device, a defect marking detection device, and an ink drying device are provided.
FIG. 11 is a diagram showing an example of equipment arrangement when two defect marking devices and two ink drying devices are provided.
FIG. 12 is a diagram of equipment arrangement when two defect marking devices, a defect marking detection device, and two ink drying devices are provided.
FIG. 13 is a view showing an example in which a defect portion is marked using one defect marking apparatus.
FIG. 14 is a diagram showing an example in which harmful defects and difficult-to-discriminate defects are separately marked using two defect marking apparatuses.
FIG. 15 is a diagram showing an arrangement example of main equipment of a line including a defect marking device and a defect marking detection device.
FIG. 16 is a diagram showing an arrangement example of main equipment on another line including a defect marking device and a defect marking detection device.
FIG. 17 is a diagram showing an arrangement example of main equipment of a line including an inspection table and a defect marking detection device in addition to the defect marking device and the defect marking detection device.
FIG. 18 is a diagram showing an arrangement example of main equipment of a coiling line including a defect marking detection device.
FIG. 19 is a diagram showing an example of the arrangement of the principal equipment of a shear line provided with a defect marking detection device.
FIG. 20 is a diagram showing an example in which defect marking is performed on a defect portion.
FIG. 21 is a diagram showing an example in which defect marking is performed at the same location on both sides in the width direction of a steel plate regardless of the location of the defective portion.
FIG. 22 is a diagram showing a state of a defect portion position and a defect marking position.
FIG. 23 is a diagram showing an example in which harmful defects and difficult-to-discriminate defects are separately marked using two defect marking apparatuses.
[Explanation of symbols]
1 Steel plate
2 Detector
3 Surface defect meter
4 Signal processor
5, 5a CRT
6 Centralized control panel
7 Secondary judgment input device
8, 8a, 8b Defect marking device
9, 9a, 9b Defect marking detection device
10 Tension reel
11 Transport roll
12 Pulse transmitter
13 Steel sheet transport distance calculation device
14 External storage device
15 cutting machine
16 Inspection table
17 Euler
18 Trimmer
19 Payoff reel
20 Harmful defects
21, 21a, 21b Defect marking
22 Defects difficult to distinguish
23 Host computer
24 Alarm device
25, 25a, 25b
26 Mobile device
27 motor
28 Gate switching device
29 Good quality Piler
30 Defective Piler
31 Steel sheet transport length display
32 Cleaning liquid injection device
33 Cleaning liquid wiper
34 Magnetic flaw detector (Internal defect meter)
35 Magnetic sensor
36 Signal processor
40, 40a, 40b Ink drying device

Claims (15)

  A line equipped with a surface defect meter or an internal defect meter in advance calculates the defect name, defect grade, defect length, and defect position in the width direction of the coil surface defect, and further identifies harmful defects and difficult-to-determine defects. In addition, a process for calculating the defect length and the defect position in the width direction of the inner flaw of the coil, and further identifying harmful defects and harmless defects, and an ink marker device for marking the coil with ink were installed. Based on the information on the harmful defect / difficult defect that has been identified in advance and the process of inserting and continuously processing the steel sheet into the continuous treatment line, when the harmful defect / distinguishable defect reaches the ink marker device, A method for manufacturing a defect-marked coil, wherein a defect position is marked with ink. Defects identified as judged difficult defect surface defect meter, and re-determination inspector claim identifies to the harmful defect-harmless defect, and wherein the marking ink to the defect position of the harmful defect 1 The manufacturing method of the coil by which the defect marking described in 2 was carried out. For the identified defects and determination difficult defect surface defect meter, as well as alarm output, performs automatic deceleration according to claim 1 or claim 2 Surveyor and performing re-determination of the determination difficult defect A method of manufacturing a coil marked with a defect. The defect marking according to claim 2 or 3 , wherein a defect image display and a defect position display are performed when an inspector re-determines a defect identified as a hard-to-determine defect by a surface defect meter. Coil manufacturing method. Based on the width direction of the defect position of the surface defect meter and internal defects meter method of manufacturing coils defect marking according to any one of claims 1 to claim 4, characterized in that to change the position of the defect markings . Depending on the steel sheet application, a method of coils defect marking according to any one of claims 1 to claim 5, characterized in that to change the position of the defect markings. The method for manufacturing a defect-marked coil according to any one of claims 1 to 6 , wherein marking is performed by distinguishing harmful defects and defects that are difficult to distinguish. 8. The method of manufacturing a defect-marked coil according to any one of claims 1 to 7 , wherein the defective defect and the hard-to-determine defect are distinguished by changing the color of the defect marking. The method for manufacturing a defect-marked coil according to any one of claims 1 to 8 , wherein the color of the defect marking is changed according to the type of the steel plate. Set up a defect marking detection device downstream of the ink marker device, any method of manufacturing coils defect marking according to claim of claims 1 to 9, characterized in that monitoring the marking state. The method for manufacturing a defect-marked coil according to any one of claims 1 to 10 , wherein the threshold value of the defect marking detection device is changed in accordance with the type of the steel plate. As a set of ink marker device and the defect marking detection device, method of manufacturing coils defect marking according to any one of claims 1 to claim 11, characterized in that to follow the defect marking location. Method of manufacturing coils defect marking according to any one of claims 1 to claim 12, characterized in that installing the ink drying device downstream of the ink marker device. An ink marker device and the defect marking detection device and the ink drying device as a set, the production method according to claim 1 or coils defect marking according to any one of claims 13, characterized in that to follow the defect marking location . The defect-marked coil manufacturing method according to any one of claims 1 to 14 , wherein threshold values of harmful defects and harmless defects are changed according to the use of the steel sheet.

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